Fuel-saving device



E. E. WARD.

FUEL SAVING DEVICE. APPLICATION FILED APR-29, I918- RENEWED JULY 20, I920.

1,352,043, PatentedSept. 7, 1920.

UNITED STATES PATENT OFFICE.

' FUEL-SAVING nnvrcn.

Specification of Letters Patent.

Patented Sept. 7, 1920.

Application filed April 29, 1918, Serial N0. 231,500. Renewed July 20, 1920. Serial No. 397,753.

To all whom it may concern Be it known that I, EDWARD E. WARD, a citizen of the United States, residing at Chicago, in the county of Cook and State of Illinois, have invented a new and useful Fuel-Saving Device, of which the following is a specification.

The subject of the present invention is a fuel saving device, and the main object of the invention is the provision of means for heating the air which is to be introduced into the firebox of a furnace by the ordinary and well known blast means.

The blast means, while utilized for introducing or injecting any fine or pulverized fuel into a furnace, finds its principal use in conjunction with wood working plants, where it is utilized for removing sawdust, shavings and the like from the plant and introducing them to the firebox of the furnace of the plant. A large quantity of cold air is necessarily carried to the firebox with the shavings and the like, and the introduction of this cold air necessitates the consumption of a large amount of fuel. It is to overcome this to some extent that the present invention has been devised.

Another object of the invention is the provision of means for thoroughly mixing hot air with the air in the blast pipe.

A still further object of the invention is the provision of means for drawing hot air from the furnace.

The invention also contemplates generally improving the construction and enhancing the utility of fuel saving devices of this character.

lVith the foregoing and other objects in view which will appear as the description proceeds, the invention resides in the combination and arrangement of parts and in the details of construction hereinafter more fully described and claimed, it being understood that changes in the precise embodiment of the invention herein disclosed can be made within the scope of what is claimed without departing from the spirit of the invention.

A practical embodiment of the invention is shown in the accompanying drawing, wherein Figure 1 is a perspective view of the invention showing the same in place upon a furnace, a fragmentary portion of which is shown;

Fig. 2 is a view in elevation, partly in sec- "tion, of a fragment of the device, showing the connection between the blast pipe and the hot air pipe;

Fig. 3 is a sectional view of the same taken at right angles to the plane of Fig. 2.

An ordinary furnace is indicated at 1 and into the firebox of the furnace is led the blast pipe 2.

In carrying out the invention, a branch pipe 3 is secured to the pipe 2 which pipe 3 is preferably provided with a damper 4: for the purpose of closing the pipe 3 when the device is not in use. At the junction of the pipe 3 with the pipe 2, and within the pipes, is mounted a heater or mixing wheel 5, against the vanes of which air passing through the pipe 3 to the pipe 2 is deflected by a deflector plate 6 which is secured to the wall of the pipe 3.

The pipe 3 is connected with the outlet of a fan casing 7 in which turns a fan 8 which is rigid on a shaft 9. The shaft 9 has a pulley 9 rigidly secured thereon for the purpose of belting the shaft to a suitable source of power for driving the fan. The intake pipe 10 of the fan casing 7 leads into any suitable part of the furnace 1 from which products of combustion and hot air may be drawn, and terminates in a hood 11.

Nhile the pipe 10 may extend into the flue-cap chamber, or any other available part of the furnace from which hot air may be drawn, it is herein shown as extending into the flue-cap chamber 12 of the furnace 1.

The blast drives by means of a blast of air, shavings and other fuel into the firebox of the furnace through the pipe 2. At the same time the fan 8 is rotated, drawing hot air from the flue-cap chamber 12 and expelling it through the pipe 3 into the pipe 2. As the air passes through the pipe 3 it strikes the baffle plate 6 and is deflected against the vanes of the beater wheel 5. This will cause a rotation of the beater wheel, which rotation will tend to mix the hot air thoroughly with the cold air of the pipe 2.

From the foregoing it will be apparent that the hot air is withdrawn from a place from which it would have gone to waste up the chimney and, consequently, has caused no loss in furnace efiiciency. It will also be evident that the air introduced into the furnace through the pipe 2 will be considerably warmed and will not cause the consumption of so much fuel in keeping up the furnace heat.

Having thus described the invention, what is claimed as new and sought by Letters Patent is Iii combination with a furnace, and cold air intake pipe thereof, a flue cap chamber, a hood positioned within the flue cap cham ber of the furnace, a casing outside of the furnace, a pipe providing communication between the hood and'casing, a rotary fan within the casing, a relatively short pipe providing communication between the easing and cold air pipe, said short pipe havin an enlar ed end ortion a niixin fan mounted in the enlarged portion, the blades thereof extending into the cold air pipe, a curved deflector plate secured to the inner 'wall of the relatively short pipe, the lower end of the deflector plate terminating at a point adjacent the path of travel of the mixing fan, for directing a blast of air onto the blades thereof.

In testimony that I claim theforegoing as my own, I have hereto ahixed my signature in the presence of two witnesses.

. EDWARD ERNEST /VARD.

Witnesses W. H. BIEMANN, CONRAD J. Wonr. 

